Five and six membered hetero s and hetero n fused ring compounds

ABSTRACT

HETEROCYCLIC COMPOUNDS HAVING AT LEAST TWO RINGS, EACH HAVING 5 TO 6 RING MEMBERS AND FUSED THROUGH A COMMON MITROGEN AND A CARBON ATOM WHICH ARE ADJACENT AD HAVING A SULFUR ATOM IN ONE RING IN A POSITION ADJACENT TO THE CARBON ATOM COMMON TO BOTH RINGS, A KETO GROUP IN THE OTHER RING IN A POSITION ADJACENT TO THE NITROGEN ATOM COMMON TO BOTH RINGS AND AN ARYL SUBSTITUENT ON THE CARBON ATOM COMMON TO BOTH RINGS ARE ANTI-INFLAMMATORY AND CNS ACTIVE AGENTS.

United States Patent US. Cl. 260-243 R 14 Claims ABSTRACT OF DISCLOSURE Heterocyclic compounds having at least two rings, each having 5 to 6 ring members and fused through a common nitrogen and a carbon atom which are adjacent and having a sulfur atom in 'one ring in a position adjacent to the carbon atom common to both rings, a keto group in the other ring in a position adjacent to the nitrogen atom common to both rings and an aryl substituent on the carbon atom common to both rings are anti-inflammatory and CNS active agents.

CROSS REFERENCE This is a continuation-in-part of copending application Ser. No. 429,906, filed Feb. 2, 1965 now abandoned.

DETAILED DESCRIPTION The present invention concerns processes for the production of new condensed heterocyclic compounds as well as the new compounds obtained by this process.

The compounds of the present invention are represented by the general formula:

wherein R is aryl optionally substituted by lower alkyl, lower alkoxy, lower alkylthio, lower alkylthio, lower alkylsulfonyl, lower alkylamino, di-lower alkylamino, lower alkanoylamino, lower alkylsulfamoyl, di-lower alkylsulfamoyl, hydroxyl, amino, sulfo, sulfamoyl, trifluoromethyl, or halogen, I

each of A and B, independently of the other is (a) ethylene or trimethyl optionally substituted by lower alkyl and/ or phenyl, (b) Q-phenyleneor (c) o-benzylene, the benzene nucleus of o-phenylene or o-benzylene being optionally substituted by lower alkyl, lower alkoxy and/ or halogen; and

m is O or 1. i I

The above compounds can be first divided into two distinct classes: those wherein the sulfur atom of the heterocyclic system is unoxidized (m; 0) and those wherein 3,646,022 Patented Feb. 29, 1972 The compounds of the present invention wherein m=0 are obtained by allowing a 'y or fi-ketocarboxylic acid or an acid chloride, acid bromide, lower alkyl ester or mixed anhydride thereof to react with a mercaptoamine. Thus a compound of general Formula II:

or the tautomeric equivalent thereof of general Formula III:

wherein X is hydroxyl, chloro, bromo, a lower alkoxy,

or lower alkanoyloxy (particularly acetoxy) and R and A are as defined above for Formula I, which is allowed to react with a compound of the general Formula IV:

H NBSH (IV) wherein B is as defined above for Formula I.

In some instances, two reaction steps can be observed in the performance of the process according to the invention.

First an intermediate product of general Formula V:

is formed which in some cases is wholly or partially in the tautomeric form corresponding to general Formula VI in which R, A and B are as defined above for Formula I. In the formation of the compound of Formula V or VI a compound of the composition X-H; i.e., water, hydrogen halide, a lower alkanol or a lower alkanoic acid is split off. An end product of general Formula I is formed therefrom by splitting off water under the reaction conditions given above. Thus, the present invention also includes the production of these end products from intermediate products of the general Formulae V and/or" VI. In 'the practice of this process, a mercapto amine'of the general Formula IV is heated, in the absence or presence of-a solvent with which water azeotropically distills, such as toluene, chlorobenzene, xylene, o-chlorotoluene, o-dichlorobenzene, amyl alcohol, at temperatures of about l00250 with a ketocar-boxylic acid or a derivative thereof corresponding to general Formulae II and/or III The condensation according to the invention is performed through the splitting off of an equimolar amount of the compound H-X and water and, if desired, can be promoted by agents which split off water such as; e.g., zinc chloride or magnesiumperchlorate or by azeotropically distilling otfthe reaction water or the liberated alkanol or the liberated acetic acid.

A modification of the procedure for the production of compounds of the general Formula I consists in subjecting reactive esters of an alcohol of the general Formula VII:

R A-(J-SH Martha 3 wherein A, B and R are as defined above, to conditions by which acid is split 01f. Such reactive esters can be the sulfates, sulfonates, particularly arylsulfonates, such as the benzenesulfonate or the p-toluenesulfonate, or halides; e.g., the chloride or bromide. The alkali and alkali earth metal carbonates, acetates, alcoholates, hydroxides and sulfides or organic bases, particularly triethylamine or pyridine, can be used as agents for the removal of acids. Alcohols or aromatic hydrocarbons with a boiling point higher than 100, chlorinated hydrocarbons, pyridine or dimethylformamide are suitable solvents. The reaction temperature is preferably between 80 and 180 C.

The reactive esters suitable as starting materials can be produced from the corresponding esters of compounds of the Formula VIII:

wherein A, B and R are as defined above by treatment with hydrogen sulfide in the presence of acid.

The compounds of the present invention of Formula I wherein m=1 are obtained from the corresponding compounds of Formula I wherein m= through oxidation. This oxidation is accomplished by treating a compound of the general Formula I wherein m=0 with hydrogen peroxide or an agent generating hydrogen peroxide. The reaction is carried out in aqueous-alcoholic solution, prefera-bly in the presence of acid.

In the compounds of the general Formula I and in the corresponding starting materials, R is, for example, phenyl, o-, mand p-tolyl, 2,3- 2,4-, 3,4-, 2,5- and 2,6-xy1yl, 0-, mand p-ethylphenyl, p-propylphenyl, p-i-sopropylphenyl, p-butylphenyl, p-isobutylphenyl, p-tert.-butylphenyl, aphenyl-p-tolyl, p-biphenylyl, o-, mand pfiuorophenyl, o-, mand p-chlorophenyl, o-, mand p-bromophenyl, 2,4- dichlorophenyl, 2,5-dichlorophenyl, 3,4-dichlorophenyl, 2-methyl-4-chlorophenyl, 2-methyl-5-chlorophenyl, 0 trifluoro-m-tolyl (i.e., m-trifluoromethylphenyl) cc,oL,ot-flifluoro-p-tolyl (i.e., p-trifluoromethylphenyl), 2,4,6-trimethylphenyl, m-methoxyphenyl, p-methoxyphenyl, methoxyphenyl, p-ethoxyphenyl, p-methylthiophenyl, o-hydroxyphenyl, m-hydroxyphenyl, p-hydroxyphenyl, 2-hydroxy-4-methylphenyl, Z-hydroxy-S-methylphenyl, pmethylsulfonylphenyl, p-aceta midophenyl, m-acetamidophenyl, m-aminophenyl, 3-acetamido-4-chlorophenyl, 3- amino-4-chlorophenyl, 2-hydroxy-4-chlorophenyl, droxy-S-chlorophenyl, 2-hydroxy-5-methoxyphenyl, 3-sulfamoyl-4-chlorophenyl, m-dimethylsulfamoylphenyl, 1- naphthyl, Z-naphthyl.

A is, for example, ethylene, trimethylene, phenylethylene, 2,2-dimethyltrimethylene, 1,2-diphenylethylene, 1,2- diphenyltrimethylene, o-phenylene, 4-methyl-opheny1ene, 3-chloro-o-phenylene, 4-chloro-o-phenylene, 3,6-dichloroo-phenylene, 3,4,5,6-tch'achloro-o-phenylene, 4-methoxyo-phenylene or o-benzylene.

B is, for example, ethylene, trimethylene, methylethylene, 1,1-dimethylethylene, 1,2-dimethylethylene, ethylethylene, 2,2-dimethyltrimethylene, o-phenylene, 4-methyl-o-phenylene, S-chloro-o-phenylene, 4-chloro-o-phenylene, 4-methoxy-oaphenylene or o-benzylene.

The non-symmetrical divalent radicals listed under A and B can actually be present in the molecule of the end product in the various possible arrangements.

Many of the compounds employed as starting materials are known or can be produced by generally known e4 processes. Examples of compounds of general Formulae IIandHIare:

3-benzoylpropionic acid, 3-(m-fluorobenzoyDpropionic acid, 3-(p-fiuorobenzoyl)propionic acid, 3-(m-chlorobenzoyl)propionic acid, 3-(p-chlorobenzoyl)propionic acid, 3- (p-bromobenzoyl propionic acid, 3-(m-toluoyl)propionic acid, 3-(p-toluoyl)propionic acid, 3-(p-ethylbenzoyl)propionic acid, 3-(pisopropylbenzoyl propionic acid; 3-(p-tert.butylbenzoyl)propionic acid, 3-(u,m,u-trifluoro-m-toluoyl)propionic acid [i.e., 3-(mtrifiuoromethylbenzoyl)propionic acid], 3-salicyloylpropionic acid, 3-(m-hydroxybenzoy1 propionic acid, 3-(p-anisoyl)propionic acid, 2-phenyl-3-benzoylpropionic acid, 2-phenyl-3- (p-anisoyl) propionic acid, 4-benzoylbutyric acid, 3,3-dimethyl-4-benzoylbutyric acid, 3,3-dirnethyl-4-(p-chlorobenzoyl)butyric acid, 2,3-diphenyl-4-benzoylbutyric acid, 2,3-dipheny1-4-(p-anisoyl)butyric acid, o-benzoylbenzoic acid, o (m'-fiuorobenzoyl)benzoic acid, 0-(p-fiuorobenzoyl)benzoic acid, o-(m'-chlorobenzoyl)benzoic acid, o-(p'-chlorobenzoyl)benzoic acid, p o- (p'-bromobenzoyl)benzoic acid, o-(m'-toluoyl)benzoic acid, o-(p'-toluoyl)benzoic acid, o-(p'-ethylbenzoyl)benzoic acid, o-(p-isopr0pylbenzoyl) benzoic acid, o-(p'-tert.butylbenzoyl)benzoic acid, I .7 o-(u,a,oz-trifluoro-m'-toluoyl)benzoic acid [i.e., o- (mtrifluorornethylbenzoyl)benzoic acid], 1 o-(a,a,a-trifiuoro-p-toluoyl)benzoic acid, [i.e., o-(p-- trifiuorornethylbenzoyl)benzoic acid], o-salicyloylbenzoic acid, o-(m'-hydroxybenzoyl)benzoic acid, o-(p'-hydroxybenzoyl) benzoic acid; o-(m'-anisoyl)benzoic acid, o-(p'-anisoyl)benzoic acid, o-(p'-ethoxybenzoyl)benzoic acid, o-(p-rnethylthiobenzoyl)benzoic acid, o-(p-methylsulf0nylbenzoyl)benzoic acid, o-(m'-aminobenzoyl)benzoic acid, o-(m'-acetamidobenzoyl)benzoic acid, o-(p'-acetamidobenzoyl)benzoic acid t I 0-(m-dimethylsulfamoylbenzoyl)benzoic acid, a o-(3,4-dichlorobenzoyl)benzoic acid, K i o-(2,4-dimethylbenzoyl)benzoic acid, I w o-(2,5-dimethylbenzoyl)benzoic acid, Y o(3,4-dirnethylbenzoy1)benzoic acid, o-(S-chlorosalicyloyl)bcnzoic acid, o-(Z-hydroxy-S-rnethylbenzoyl)benzoic acid, o-(2-hydroxy-5-methoxy benzoyl)benzoicacid, o-(3-amino-4-chlorobnzoyl)benzoic acid, o-( 3-acetamido)-4-chlorobenzoyl benzoic acid, o -(3-sulfam0y1-4-chlorobenzoyl)benzoic acid, o-(2,4,6-trimethylbenzoyl)benzoic acid, 2-benzoyl-3-chlorobenzoic acid, l 2-benzoyl-3,4,5,6-tetrachlorobenzoic acid, I 2-(p-chlorobenzoyl)-3-chlorobenzoic acid, Z-(p-chlorobenzoyl)-3,4,5,6-tetrachlorobenzoic acid, Z-naphthoylbenzoic acid, I I o-phenacylbenzoic acid, o-benzoylphenylacetic acid, o-benzoylbenzoie acid methyl ester,

' 3-chloro-3-phenylphthalide.

As starting materials of the general Formula IV can be mentioned: Z-aminoethane thiol, I-amino-Z-propane thiol, 2-amino-l-propane thiol, 1-amino-2-methyl-2-propane thiol, l-amino-Z-butane thiol, 2-amino-3-butane thiol, o-aminobenzene thiol (o-aminothiophenol), 2- amino-4-chlorobenzene thiol, '3-amino-l-propane thiol, 2,2-dimethyl-3-amino-l-propane thiol, o-amino-a-toluene thiol (o-aminobenzylmercaptan).

The new compounds produced, generally with good yields, by this prcessare distinguished by valuable pharmacological properties. In particular, such compounds have anti-infiammatory, anaesthesia-potentiating, anticonvulsive and analgetic activity with, at the same time, relatively slight toxicity. The anti-inflammatory activity of the compounds of the general Formula I is seen, :for example, in tests on animals having peritonitis induced by formalin. On administration of200 mg. per kg. body weight per os to rats, for example, 9b-phenyl-2,3-dihydrothiazolo[2,3-a] isoindol-S(9bH)-one, 9b (p-tolyl) -2,3-dihydro-thi-azol[2,3-a]isoindol (9bH) one and 9b (pmethoxyphenyl 2,3 dihydro -thiazolo[2,3-a]isoindol- 5(9bH)-one caused a reduction of exudation of more than 45%, compared with control animals. Similar favorable results are also obtained, for example, in tests involving edema of the rats paw induced by formalin and albumin, in experimental granuloma, and in pyrexia in rats.

Therapeutical administration of the compounds of general Formula I is mainly oral or rectal. The compounds can also be administered parenterally in the form of aqueous dispersions produced with the aid of solubility promoters and/ or emulsifying agents.

Compounds of the general Formula I, in particular those in which R is substituted by hydroxyl or amino groups, can also be used as intermediate products, for example, for the production of other pharmacologically valuable substances.

Preferred anti-inflammatory agents according to the invention are those of the general formula wherein R is phenyl, lower alkylphenyl, benzylphenyl, phenylphenyl (biphenylyl), fluorophenyl, bromophenyl, chlorophenyl, trifluoromethylphenyl, lower alkoxyphenyl, lower alkylthiophenyl, hydroxyphenyl, lower alkylsulfonylphenyl, lower alkanoylaminophenyl, aminophenyl, sulfamylphenyl, N-lower alkyl sulfamylphenyl and naphthyl, each of A and B is a,w-alkylene, lower alkyl-substituted a,w-alkylene, phenyl-substituted a,w-alkylene, and ophenylene, alkylene being of from 2 to 3 carbon atoms and o-phenylene" being optionally substituted by lower alkyl, lower alkoxy and/0r fluoro, chloro or bromo; and m is 0 or 1. i 1

Within the scope of the present invention are obvious extensions and/or modifications of the foregoing compounds. For example those compounds of the present invention wherein m is O and A and B are essentially aliphatic in nature can be depicted by the following structure and definition, which are substantially equivalent to the structure and definition associated with general Formula I:

wherein R represents aryl or ar(lower)alkyl; the aryl and the arof ar(lower)alkyl being of the formula each of R R R R and R is a member of the group hydrogen, straight chain(lower)alkyl, aryl or ar(lower)alkyl; or together with the member bound to the same carbon atom, polymethylene having from 4 to 6 carbon atoms; the aryl and the arof ar(lower) alkyl being of the formula l ln R1:

there being at most three of the members other than hydrogen bound to adjacent carbon atoms; a plurality of polymethylene groups not being bound to adjacent carbon atoms; and there being a maximum of four members of R, R R R R and R other than hydrogen;

each R R R R and R is a member of the group hydrogen, chloro, fluoro, bromo, lower alkyl, lower alkoxy, trifiuoromethyl or lower alkylthio; or together with the member on the adjacent ring carbon atom, methylenedioxy; at least one of R R R R and R being hydrogen; a plurality of trifiuoromethyl groups not being bound to adjacent carbon atoms; each of R and R of aryl and ar(lower)alkyl groups being hydrogen in a plurality of such groups bound to the same carbon atoms; and each R of aryl and ar- (lower)alkyl groups being hydrogen in a plurality of such groups bound to adjacent carbon atoms;

r represents 1 or 2; and

n represents 2 or 3.

Four distinct heterocyclic systems falling within Formula I are also embraced by Formula X. These are as follows:

(1) 2,3,7,7a tetrahydro-pyrrolo[2,1-b]thiazol-5(6II-)- one (alternatively named as 2,3,5, 6,7,7a-hexahydro-pyrrolo[2,1-6]thiazol-5-one), i.e., those compounds of Formula I where each of A and B is ethylene or those compounds of Formula X wherein r is l and n is 2. This system, exclusive of substitution, can be represented as fol- (2) Tetrahydro-ZH-pyrrolo [2,1-b] [l,3]thiazin-6(7H)- one (alternatively named as 3,4,6,7,8,8a-hexahydro-2H- pyrrolo[2,1-b][l,3]thiazin-6-one); i.e., those compounds of Formula I wherein A is ethylene and B is trimethylene or those components of Formula X wherein r is l and n is 3. This system, exclusive of substitution, can be represented as follows:

(3) Hexahydro 5H thiazolo[3,2-a]pyridin 5 one (alternatively named as 2,3,6,7,8,8a-hexahydro-5H-thiazolo[3,2-a1-pyridin-5-one); i.e., those compounds of Formula I wherein A is trimethylene and Bis ethylene or those compounds of Formula X wherein r is2 and n is 2.

This system, exclusive of substitution, may be represented as follows:

(4) Hexahydro 2H,6H pyrido[2,1-b] [1,31thiazin-6- one (alternatively named as 2,3,7,8,9,9a-hexahydro-4H, 6H-pyrido[2,l-b][l,3]tbiazin-6-one); i.e., those compounds of Formula 1 wherein each of A and B is trimethylene or those compounds of Formula X wherein is 2 and n is 3. This system, exclusive of substitution, may be represented as follows:

A further presentation of the compounds of the present invention is depicted by the formula:

rislorZand nis2or3.

The following examples will serve to further typify the nature of this invention without being a limitation on the scope thereof.

EXAMPLE 1 22.6 parts of o-benzoyl-benzoic acid and 9.4 parts of Z-amino-ethane thiol are kept for 1 hour at 150 in an open flask. After cooling, the crude product is recrystallized from benzene. 9b-phenyl-2,3-dihydro-thiazolo[2,3-a] isoindole-(9bH)-one of the formula is so obtained. M.P. 104-106;

The following compounds are obtained by the same procedure from the corresponding varied starting materialszf g i (3.) 9b (p methoxyphenyl) 2,3 dihydro thiazolo ['2,3-a]iso indo1 '5(9bH) one, M.P. 86-88, from o- (p' anisoyl) benzoic acid and 2-amino-ethane thiol;

(1)) 9b (p chlorophenyl) 2,3 dihydro-thiazo1o[2,3-a] isoindol-5(9bH)-one, MJP. 125-129; (0) 9b (p bromophenyl) 2,3 dihydro-thiazolo [2,3-a

isoindo1-5(9bH)-one, 'M.P.' 154-1562 p (d) 9b (p fluorophenyl) 2,3 dihydro thiazolo- [2,3-a]isoindol 5(9bI-I) one, B.P. l90200/0.005 Torr, amorphous, and (e) b (p tolyl) 2,3 dihydro indol 5(9bH) one, M.P. -863. I (f) 9b (p-methylthio phenyl) 2,3 dihydro-thiazolo [2,3-a]is0indol 5(9bI-I) one from o-(p'-methylthiobenzoy1)-benzoic acid and Z-amino-ethanethiol. (g) 9b (m dimethylsulfamyl phenyl) 2,3 'dihydrothiazolo[2,3-a]isoindol-5 (9bH)one. (h) 9b (on naphthyl) 4 2,3 dihydro thiazolo[2,3-a]

isoindol S (9bH) one. (i) 3 ethyl 9b phenyl 2,3 dihydro isoindo1-5(9bI-I)-one. a (j) 3 methyl 9b (m sulfamyl phenyl) 2,3 di hydro-thiazolo[2,3a]isoindol-5(9bH)-one. a (k) 9b (p phenyl-phenyl)-2,3-dihydro-thiazolo[2,3-a]

isoindol-5(9bH)-one. i r

thiazolo [2,3-a]isothiazolo[2,3-a]

EXAM PLE 2 26.2 parts of o-(p'-chlorobenzoyl)-benzoic acid and 12.8 parts of o-aminobenzene thiol(o-aminothiophenol) are heated to 200 and kept at this temperature for 1 hour. After cooling, the crude product is recrystallized from ethyl acetate. In this way 4b-(p-chlorophenyl)isoindolo[2,3-b1-benzothiazol-l1(4bH) one of the formula is obtained. M.P. ZOO-201.

The following compounds are obtained by the same procedure from the correspondingly varied starting materials: I

24.2 parts of o-(m'-hydroxybenzoyl)-benzoic acid and 7.7 parts of Z-amino-ethane thiol are boiled with 200 parts by 'volume of chlorobenzene. Chlorobenzene is allowed to distill olf slowly ,.with the reaction Water until the condensation point has risen to"nl30 after about 1-2 hours. After cooling, the product is precipitated by the addition of petroleum ether and it is then recrystallized from methanol. In this way, 9b-(m-hydroxyphenyl) 2,3 dihydro-thiazolo[2,3-a1isoindol-5(9bH)- one of the formula is obtained The following compounds are produced analogous manner:

(a) 9b-(m-chlorophenyl)-2,3-dihydro-thiazolo[2,3-a]

isoindol-(9bI-I) -one, M.P. 134-136 (c) 9b-(m-methoxyphenyl)2,3-dihydro-thiazolo[2,3-a]

isoindol-S (9bH)-one, M.P. 140-143 (d) 9b-(m-tolyl)-2,3-dihydro-thiazolo[2,3-a1isoindol- 5(9bH)-one, M.P. 100-103 (f) 9b- (p-hydroxyphenyl),-2,3-dihydro-thiazolo [2,3-a]

isoindol-5-( 9bH -one, M.P..=23Q-232 (g) 9b- (p-ethylphenyl -2,-3-dihydro -thiazolo [2,3-a] isoindol-S (9bH)-one, B.P. 210-220" 0.025 torr;

(h) 9b- (p-ethoxyphenyl )'-2,3'-dihydro-thiazo1o [2,3-a]

isoindol-5(9bH) -one, M.P. 100-101.5

= [2,3-a1isoindol-5(9bH)-one,M.P. 100-103;

' 5(9bH)-one, M.P. 153-155, and

(l) 9b-(2',5'-xylyl)-2,3-dihydro-thiazolo[2,3-a1isoindol- 5(9bH)-one, M.P. 100-101.5".

in an EXAMPLE 4 30.4 parts of 'o-(p'-methylsulfonylbenzoyl)-benzoic acid and 8.1 parts of 2-amino-ethane thiol are boiled with 300 parts .by volume of p-chlorotoluene. The reactionuw'ater formed and p-chlorotoluene are distilled off azeotropically untilthe boiling point of 160 is attained after" about 2 hours. The remaining chlorotoluene is distilled off in vacuoJThe dark residue is boiled down several'times with'benzene. The extracts are evaporated to dryness and the crude product so obtained is recrystallized several times from methanol. In this way, 9b-(pmethylsulfonylphenyl) 2,3 dihydro-thia'zolo[2,3-a] isoindol-5(9bH)-one is obtained of the formula S O CH;

' *Inasimilarfashion (a) 9b-(3,4'-dichloropheny1)-2,3-dihydro-thiazolo (b) 9b-(p-benzylphenyl) -2,3-dihydro-thiazolo [2,3-a]

are obtained from the correspondingly varied starting materials by the procedure described in Example 4.

crystallizes. M.P. 163-165.

The following compounds are produced in an analogous manner:

(a) 10b- (p-chlorophenyl -3,4-dihydro-2H-[ 1,3 thiazino [2,3-a]isoindol-6(10bH)-one, M.P. -127 (b) 10b-(p-methoxyphenyl)3,4-dihydro-2H[1,3]thiazino[2,3-a]isoindol-6(10bH)-one, M.P. 117-119 (d) 9-chloro-10b-phenyl-3,4-dihydro-2H[1,3]thiazino [2,3-a] isoindol-6( 10bH -one,

(e) 8-ethyl-10b-phenyl-3 ,4-dihydro-2H[ 1,3 thiazino [2,3-a]isoindol-6(10bH)-one, and

(f) 9-methoxy-10b-phenyl-3,4-dihydro-2H[ 1,3 ]thiazino [2,3-a1isoindol-6 10bH)-one.

EXAMPLE 6 17.8 parts of 3-benzoyl-propionic acid and 8 parts of 2-amino-ethane thiol are heated for 2 hours at The residue is dissolved in ethyl acetate, the solution is filtered over charcoal and the residue is concentrated. On recrystallizing from benzene, pure 7a-phenyl-2,3,7,7a-tetrahydro-pyrrolo[2,1-b]thiazol 5(6H)-one of the formula is obtained, M.P. 73. This compound can be alternatively described as 7a phenyl 2,3,5,6,7,7a hexahydro-pyrrolo [2,1-b]thiazol-5-one.

The following compounds are obtained in an analogous manner:

(a) 7a-(p-methoxyphenyl)-2,3,7,7a-tetrahydro-pyrrolo [2,1-b]thiazol-5(6H)-one, MB. 104";

(b) 6,7a-dipheny1-2,3,7,7a-tetrahydro-pyrrolo[2,1-b]

thiazol-5(6H)-one, M.P. 107,

(0) 7a- (o-hydroxyphenyl) -2,3 ,7,7a-tetrahydro-pyrrolo [2,1-b1thiazol-5 (6H)-one, M.P. 177,

((1) 3-(p-anisy1)-7a-phenyl-2,3,7,7a-tetrahydro-pyrrolo (e) 3-(p-chloro-phenyl)-7a-pheny12,3,7,7a-tetrahydropyrrolo[2,l-b]thiazol-5 (6H)-one.

EXAMPLE 7 19.2 parts of 4-benzloyl-butyric acid, 8 parts of Z-amino-ethane thiol and 200 parts of chlorobenzene are heated for 1 hour while distilling off water and chlorobenzeue. The remaining chlorobenzene is removed in vacuo, the residue is dissolved in hot ethyl acetate and cooled whereupon 8a phenyl-hexahydro-SH-thiazolo[3,2-a]pyridin-S- one of the formula EXAMPLE 8 crystallizes out. On recrystallizing from ethyl acetate, it melts at 138". This compound can be alternatively described as 9a-pheny1-2,3,7,8,9,9a-heXahydro-4H,6H-pyrido [2,1-b] [1,3] thiazin-G-one.

EXAMPLE 9 17.8 parts of B-benzoyl-propionic acid and 9.1 parts of 3-amino-propane thiol are heated for 3 hours at 170. The residue is then extracted with hot ethyl acetate, the solution is clarified and concentrated, whereupon the 8a-phenyl tetrahydro-ZH-pyrrolofi,l-b][1,3]thiazin-6(7H)-one of the formula i crystallizes out. It is obtained in pure form by recrystallization from cyclohexane. M.P. 122. This compound can be alternatively described as 8a-phenyl-3,4,6,7,8,8a-hexahydro-2H-pyrrolo[2,1-b][l,3]thiazin-6 one.' v

12 EXAMPLE 10 17.8 parts of 3-benzoyl-propionic acid, 13 parts of oaminobenzene thiol (o-aminothiophenol) and 200 parts of chlorobenzene are heated for 1% hours in such a way that about half the chlorobenzene distills 05 with the water formed. The remaining chlorobenzene is evaporated ofi in vacuo and the residue is dissolved in benzene, ligroin is added and the product is allowed to crystallize out. On recrystallizing from methanol, the pure 3aphenyl 3,3a dihydro pyrrolo[2,1 bJbenzothiazoll(2H)-one of the formula is obtained. M.P. 102. S'a-(p-mthoxyphenyl)-3,3a-dihydropyrrolo[2,1-b]benzothiazol-1(2H)-one, M.P. 113", is produced in an analogous manner. 1

34.6 parts of 2-(3-bromopropyl)-3-hydroxy-3-phenylphthalimidine (=2-- (3'-bromopropyl) 3-hydroxy-3- phenyl-l-isoindolinone)i' obtained from N-(3'-bromopropyl)-phthalimidc and phenylmagnesium bromide, are dissolved in 1600 parts of glacial acetic acid and 36 parts of 92% sulfuric acid are added. Hydrogen sulfide is then introduced for 24 hours. The yellow solution is poured into 8000 parts of ice water, neutralized with approximately 240 parts of sodium bicarbonate, and the oil which then separates is dissolved in ether. After drying and evaporating, 35 parts of crude 2-(3'-bromopropyl)- 3-mercapto-3phenyl-phthalimidine are obtained.

The crude product is dissolved in 200 parts of isopropyl alcohol in an atmosphere of nitrogen, and a solution of 2.5 parts of sodium in 300 parts of isopropyl alcohol is added. The mixture is boiled for 5 hours, filtered and evaporated in vacuo. Theresidue is recrystallized twice from ethyl acetate. 10b-phenyl-3,4-dihydro- 2H-[1,3]thiazino[2,3-a]isoindol 6(l0bH) one of the formula is obtained; it metls at 162-165".

On using 2-(2'-bromoethyl)-3-hydroxy-3-phenylphthalimidine as starting material, 9b-phenyl-2,3-dihydro thiazolo [2,3-a]isoindol-5((9bH)-one melting at 104- 106 is obtainedin an analogous manner.

In an analogous manner 10b-(p-methoxyphenyl)-3,4- dihydro- 2H [I,3]thiazino[2,3 a]isoindo1'- 6(10bH)- one-l-oxide, M.P. -183", is obtained from 10b-.(pmethoxyphenyl 3,4 dihydro 2H-[1,3]-thiazino[2,3-a] isoindol-6(l0bH)-one.' j v 1 13 What is claimed is: 1. A compound of the formula:

is 12' 2); R R

wherein each of R R R R and R is hydrogen, lower alkyl or phenyl, there being a maximum of four members of R R R R and R other than each of R R R R and R is hydrogen chloro, fluoro, lower alkyl, lower alkoxy or trifluoromethyl, at least one of R R R R and R being hydrogen, a plurality of trifluoromethyl groups not being bound to adjacent carbon atoms; r is l or 2; and n is 2 or 3.

2. A compound of claim 1 wherein r is 1, n is 2 and R R and R are as defined in claim 1.

3. A compound of claim 1 wherein r is 1, n is 3 and R R and R are as defined in claim 1.

4. A compound of claim 1 wherein r is 2 n is 2 and R R R R and R are as defined in claim 1.

5. A compound of claim 1 wherein r is 2, n is 3 and R R R R and R are as defined in claim 1.

6. 8a phenyl 2,3,6,7,8,8a hexahydro-SH-thiazolo [3,2-a]pyridin-5-one.

7. The compound according to claim 1 which is 6,7adiphenyl 2,3,7,7a tetrahydro-pyrrolo[2,l b]thiazol- 5 (6H)-one.

8. A compound of the formula:

wherein R is phenyl, lower alkylphenyl, fluorophenyl bromophenyl, chlorophenyl, trifluoromtehylphenyl or lower alkoxyphenyl.

9. The compound according to claim 8 wherein R is phenyl, said compound thus being 7a-phenyl-2,3,7,7a-

tetrahydro-pyrrolo[2, l-b] thiazol-S 6H) -one.

10. A compound of the formula:

wherein R is phenyl, lower alphylphenyl, fluorophenyl, bromophenyl, chlorophenyl, trifluoromethylphenyl or lower alkoxyphenyl. 13. A compound of the formula:

wherein R is phenyl, lower alkylphenyl, fluorophenyl, bromophenyl, chlorophenyl, trifluoromethylphenyl or lower alkoxyphenyl. 14. The compound according to claim 13 wherein R is phenyl, said compound being 9a-phenyl-hexahydro-2H, 6H-pyrido[2,1-b] 1,3]thiazin-6-one.

References Cited UNITED STATES PATENTS 3,334,091 8/ 1967 Houlihan 260-243 3,334,113 8/1967 Houlihan 260243 X 3,408,350 10/1968 Houlihan 260-243 JOHN M. FORD, Primary Examiner U.S. Cl. X.R.

260-306], 293.4 E, 558 R, 559 R, 558 S, 558 A, 326.5 S, 293.4 R, 326.5 FL, 294.7 R 424246, 270

CASE I-l928/CIP T222 3 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 646,022 A DatedFebrgeg-y 29, 1972 Inventor(s) WILFRIED GRAF ET AL It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

r- O w Column 13, line 14, after "than"'insert A hydrogen; line L5, delete "trifluoromtehylp henyl" and insert trifluoromethylphenyl Signed and sealed this 11 th' day of July 1972.

(SEAL) Atte st:

EDWARD M.FLETGHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents 

